drivers/char/drm/drm_drawable.c

   1 /**
   2  * \file drm_drawable.c
   3  * IOCTLs for drawables
   4  *
   5  * \author Rickard E. (Rik) Faith <faith@valinux.com>
   6  * \author Gareth Hughes <gareth@valinux.com>
   7  * \author Michel Dänzer <michel@tungstengraphics.com>
   8  */
   9
  10 /*
  11  * Created: Tue Feb  2 08:37:54 1999 by faith@valinux.com
  12  *
  13  * Copyright 1999 Precision Insight, Inc., Cedar Park, Texas.
  14  * Copyright 2000 VA Linux Systems, Inc., Sunnyvale, California.
  15  * Copyright 2006 Tungsten Graphics, Inc., Bismarck, North Dakota.
  16  * All Rights Reserved.
  17  *
  18  * Permission is hereby granted, free of charge, to any person obtaining a
  19  * copy of this software and associated documentation files (the "Software"),
  20  * to deal in the Software without restriction, including without limitation
  21  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
  22  * and/or sell copies of the Software, and to permit persons to whom the
  23  * Software is furnished to do so, subject to the following conditions:
  24  *
  25  * The above copyright notice and this permission notice (including the next
  26  * paragraph) shall be included in all copies or substantial portions of the
  27  * Software.
  28  *
  29  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  30  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  31  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
  32  * VA LINUX SYSTEMS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM, DAMAGES OR
  33  * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
  34  * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
  35  * OTHER DEALINGS IN THE SOFTWARE.
  36  */
  37
  38 #include "drmP.h"
  39
  40 /**
  41  * Allocate drawable ID and memory to store information about it.
  42  */
  43 int drm_adddraw(DRM_IOCTL_ARGS)
  44 {
  45         DRM_DEVICE;
  46         unsigned long irqflags;
  47         int i, j;
  48         u32 *bitfield = dev->drw_bitfield;
  49         unsigned int bitfield_length = dev->drw_bitfield_length;
  50         struct drm_drawable_info **info = dev->drw_info;
  51         unsigned int info_length = dev->drw_info_length;
  52         struct drm_draw draw;
  53
  54         for (i = 0, j = 0; i < bitfield_length; i++) {
  55                 if (bitfield[i] == ~0)
  56                         continue;
  57
  58                 for (; j < 8 * sizeof(*bitfield); j++)
  59                         if (!(bitfield[i] & (1 << j)))
  60                                 goto done;
  61         }
  62 done:
  63
  64         if (i == bitfield_length) {
  65                 bitfield_length++;
  66
  67                 bitfield = drm_alloc(bitfield_length * sizeof(*bitfield),
  68                                      DRM_MEM_BUFS);
  69
  70                 if (!bitfield) {
  71                         DRM_ERROR("Failed to allocate new drawable bitfield\n");
  72                         return DRM_ERR(ENOMEM);
  73                 }
  74
  75                 if (8 * sizeof(*bitfield) * bitfield_length > info_length) {
  76                         info_length += 8 * sizeof(*bitfield);
  77
  78                         info = drm_alloc(info_length * sizeof(*info),
  79                                          DRM_MEM_BUFS);
  80
  81                         if (!info) {
  82                                 DRM_ERROR("Failed to allocate new drawable info"
  83                                           " array\n");
  84
  85                                 drm_free(bitfield,
  86                                          bitfield_length * sizeof(*bitfield),
  87                                          DRM_MEM_BUFS);
  88                                 return DRM_ERR(ENOMEM);
  89                         }
  90                 }
  91
  92                 bitfield[i] = 0;
  93         }
  94
  95         draw.handle = i * 8 * sizeof(*bitfield) + j + 1;
  96         DRM_DEBUG("%d\n", draw.handle);
  97
  98         spin_lock_irqsave(&dev->drw_lock, irqflags);
  99
 100         bitfield[i] |= 1 << j;
 101         info[draw.handle - 1] = NULL;
 102
 103         if (bitfield != dev->drw_bitfield) {
 104                 memcpy(bitfield, dev->drw_bitfield, dev->drw_bitfield_length *
 105                        sizeof(*bitfield));
 106                 drm_free(dev->drw_bitfield, sizeof(*bitfield) *
 107                          dev->drw_bitfield_length, DRM_MEM_BUFS);
 108                 dev->drw_bitfield = bitfield;
 109                 dev->drw_bitfield_length = bitfield_length;
 110         }
 111
 112         if (info != dev->drw_info) {
 113                 memcpy(info, dev->drw_info, dev->drw_info_length *
 114                        sizeof(*info));
 115                 drm_free(dev->drw_info, sizeof(*info) * dev->drw_info_length,
 116                          DRM_MEM_BUFS);
 117                 dev->drw_info = info;
 118                 dev->drw_info_length = info_length;
 119         }
 120
 121         spin_unlock_irqrestore(&dev->drw_lock, irqflags);
 122
 123         DRM_COPY_TO_USER_IOCTL((struct drm_draw __user *)data, draw, sizeof(draw));
 124
 125         return 0;
 126 }
 127
 128 /**
 129  * Free drawable ID and memory to store information about it.
 130  */
 131 int drm_rmdraw(DRM_IOCTL_ARGS)
 132 {
 133         DRM_DEVICE;
 134         struct drm_draw draw;
 135         int id, idx;
 136         unsigned int shift;
 137         unsigned long irqflags;
 138         u32 *bitfield = dev->drw_bitfield;
 139         unsigned int bitfield_length = dev->drw_bitfield_length;
 140         struct drm_drawable_info **info = dev->drw_info;
 141         unsigned int info_length = dev->drw_info_length;
 142
 143         DRM_COPY_FROM_USER_IOCTL(draw, (struct drm_draw __user *) data,
 144                                  sizeof(draw));
 145
 146         id = draw.handle - 1;
 147         idx = id / (8 * sizeof(*bitfield));
 148         shift = id % (8 * sizeof(*bitfield));
 149
 150         if (idx < 0 || idx >= bitfield_length ||
 151             !(bitfield[idx] & (1 << shift))) {
 152                 DRM_DEBUG("No such drawable %d\n", draw.handle);
 153                 return 0;
 154         }
 155
 156         spin_lock_irqsave(&dev->drw_lock, irqflags);
 157
 158         bitfield[idx] &= ~(1 << shift);
 159
 160         spin_unlock_irqrestore(&dev->drw_lock, irqflags);
 161
 162         if (info[id]) {
 163                 drm_free(info[id]->rects, info[id]->num_rects *
 164                          sizeof(struct drm_clip_rect), DRM_MEM_BUFS);
 165                 drm_free(info[id], sizeof(**info), DRM_MEM_BUFS);
 166         }
 167
 168         /* Can we shrink the arrays? */
 169         if (idx == bitfield_length - 1) {
 170                 while (idx >= 0 && !bitfield[idx])
 171                         --idx;
 172
 173                 bitfield_length = idx + 1;
 174
 175                 bitfield = NULL;
 176
 177                 if (bitfield_length) {
 178                         if (bitfield_length != dev->drw_bitfield_length)
 179                                 bitfield = drm_alloc(bitfield_length *
 180                                                      sizeof(*bitfield),
 181                                                      DRM_MEM_BUFS);
 182
 183                         if (!bitfield) {
 184                                 bitfield = dev->drw_bitfield;
 185                                 bitfield_length = dev->drw_bitfield_length;
 186                         }
 187                 }
 188         }
 189
 190         if (bitfield != dev->drw_bitfield) {
 191                 info_length = 8 * sizeof(*bitfield) * bitfield_length;
 192
 193                 if (info_length) {
 194                         info = drm_alloc(info_length * sizeof(*info),
 195                                          DRM_MEM_BUFS);
 196
 197                         if (!info) {
 198                                 info = dev->drw_info;
 199                                 info_length = dev->drw_info_length;
 200                         }
 201                 } else
 202                         info = NULL;
 203
 204                 spin_lock_irqsave(&dev->drw_lock, irqflags);
 205
 206                 if (bitfield)
 207                         memcpy(bitfield, dev->drw_bitfield, bitfield_length *
 208                                sizeof(*bitfield));
 209                 drm_free(dev->drw_bitfield, sizeof(*bitfield) *
 210                          dev->drw_bitfield_length, DRM_MEM_BUFS);
 211                 dev->drw_bitfield = bitfield;
 212                 dev->drw_bitfield_length = bitfield_length;
 213
 214                 if (info != dev->drw_info) {
 215                         if (info)
 216                                 memcpy(info, dev->drw_info, info_length *
 217                                        sizeof(*info));
 218                         drm_free(dev->drw_info, sizeof(*info) *
 219                                  dev->drw_info_length, DRM_MEM_BUFS);
 220                         dev->drw_info = info;
 221                         dev->drw_info_length = info_length;
 222                 }
 223
 224                 spin_unlock_irqrestore(&dev->drw_lock, irqflags);
 225         }
 226
 227         DRM_DEBUG("%d\n", draw.handle);
 228         return 0;
 229 }
 230
 231 int drm_update_drawable_info(DRM_IOCTL_ARGS) {
 232         DRM_DEVICE;
 233         struct drm_update_draw update;
 234         unsigned int id, idx, shift;
 235         u32 *bitfield = dev->drw_bitfield;
 236         unsigned long irqflags, bitfield_length = dev->drw_bitfield_length;
 237         struct drm_drawable_info *info;
 238         struct drm_clip_rect *rects;
 239         int err;
 240
 241         DRM_COPY_FROM_USER_IOCTL(update, (struct drm_update_draw __user *) data,
 242                                  sizeof(update));
 243
 244         id = update.handle - 1;
 245         idx = id / (8 * sizeof(*bitfield));
 246         shift = id % (8 * sizeof(*bitfield));
 247
 248         if (idx < 0 || idx >= bitfield_length ||
 249             !(bitfield[idx] & (1 << shift))) {
 250                 DRM_ERROR("No such drawable %d\n", update.handle);
 251                 return DRM_ERR(EINVAL);
 252         }
 253
 254         info = dev->drw_info[id];
 255
 256         if (!info) {
 257                 info = drm_calloc(1, sizeof(struct drm_drawable_info), DRM_MEM_BUFS);
 258
 259                 if (!info) {
 260                         DRM_ERROR("Failed to allocate drawable info memory\n");
 261                         return DRM_ERR(ENOMEM);
 262                 }
 263         }
 264
 265         switch (update.type) {
 266         case DRM_DRAWABLE_CLIPRECTS:
 267                 if (update.num != info->num_rects) {
 268                         rects = drm_alloc(update.num * sizeof(struct drm_clip_rect),
 269                                          DRM_MEM_BUFS);
 270                 } else
 271                         rects = info->rects;
 272
 273                 if (update.num && !rects) {
 274                         DRM_ERROR("Failed to allocate cliprect memory\n");
 275                         err = DRM_ERR(ENOMEM);
 276                         goto error;
 277                 }
 278
 279                 if (update.num && DRM_COPY_FROM_USER(rects,
 280                                                      (struct drm_clip_rect __user *)
 281                                                      (unsigned long)update.data,
 282                                                      update.num *
 283                                                      sizeof(*rects))) {
 284                         DRM_ERROR("Failed to copy cliprects from userspace\n");
 285                         err = DRM_ERR(EFAULT);
 286                         goto error;
 287                 }
 288
 289                 spin_lock_irqsave(&dev->drw_lock, irqflags);
 290
 291                 if (rects != info->rects) {
 292                         drm_free(info->rects, info->num_rects *
 293                                  sizeof(struct drm_clip_rect), DRM_MEM_BUFS);
 294                 }
 295
 296                 info->rects = rects;
 297                 info->num_rects = update.num;
 298                 dev->drw_info[id] = info;
 299
 300                 spin_unlock_irqrestore(&dev->drw_lock, irqflags);
 301
 302                 DRM_DEBUG("Updated %d cliprects for drawable %d\n",
 303                           info->num_rects, id);
 304                 break;
 305         default:
 306                 DRM_ERROR("Invalid update type %d\n", update.type);
 307                 return DRM_ERR(EINVAL);
 308         }
 309
 310         return 0;
 311
 312 error:
 313         if (!dev->drw_info[id])
 314                 drm_free(info, sizeof(*info), DRM_MEM_BUFS);
 315         else if (rects != dev->drw_info[id]->rects)
 316                 drm_free(rects, update.num *
 317                          sizeof(struct drm_clip_rect), DRM_MEM_BUFS);
 318
 319         return err;
 320 }
 321
 322 /**
 323  * Caller must hold the drawable spinlock!
 324  */
 325 struct drm_drawable_info *drm_get_drawable_info(struct drm_device *dev, drm_drawable_t id) {
 326         u32 *bitfield = dev->drw_bitfield;
 327         unsigned int idx, shift;
 328
 329         id--;
 330         idx = id / (8 * sizeof(*bitfield));
 331         shift = id % (8 * sizeof(*bitfield));
 332
 333         if (idx < 0 || idx >= dev->drw_bitfield_length ||
 334             !(bitfield[idx] & (1 << shift))) {
 335                 DRM_DEBUG("No such drawable %d\n", id);
 336                 return NULL;
 337         }
 338
 339         return dev->drw_info[id];
 340 }
 341 EXPORT_SYMBOL(drm_get_drawable_info);